Who does not know. You are traveling and suddenly the battery from the Tablet or Smartphone is almost empty. The solution is the Power Bank of RAVPOWER. She has a more than 10,000 mAh big battery that can be easily recharged at the centrally positioned Micro USB port. On the left is the 2.1 amp, the right of the Micro USB port of 1 Ampere. Upstairs there is an LED display with 4 blue lights. These are for the battery level of the device. (25,50,75,100%) I invite my Tablet Fire HDX 7 at the left port, right on my smartphone. They are charged in about the same speed, what does it matter that the tablet has a larger battery than the smartphone, but this is offset by the different amperage. Say the left link is faster than the charged right if the different amperage. The Power Bank comes in a cardboard-quality. In addition, two USB lie on Micro USB cable that look very valuable and an iPhone adapter. In addition, even obtained an envelope / bag which is sealed with an elastic band and the Power Bank protects. A power adapter is not included, but is also nowadays the trend and in every household probably has more than once. I am very satisfied with the price / performance ratio. The shipping was fast. All top in everything.